Apparatus for automatically regulating the temperature of a supply of liquid.



' G. STERN.

APPARATUS FOR AUTOMATICALLY REGULATING THE TEMPERATURE OF A SUPPLY OF LIQUID. APPLICATION FILED AUG.25| I913.

1,56,505. Patented 0013.12, 1915.

strATEsPATENT OFFICE.

sumo smart, or rmirxroR'r-oN-rHn-Mnm, GERMANY, ASSIGNOR TO THE FIRM or BAMBERGEB 'LEROI & COMPANY, or FnANKFoR'r-omrHE-Mnm, GERMANY.

APPARATUS FOR AUTOMATICALLY,REGULATING THE TEMPERATURE OF A SUPPLY OF LIQUID. 5'

Specification of Letters Patent.

Patented Oct. 12, 1915.

Application filed August 25, 1913: Serial No. 786,473.

at a constant temperature is obtalned, as for example to a bath which is to be kept for a lengthy period at a,. predetermined tem-,

perature. I v

The invention is illustrated in the accompanying drawings, in which Figure 1 is anelevation of the apparatus, partly in section, and Fig; 2 an elevation viewed at right: angles to the plane 61 Fig. 1, also partly in section.

The apparatus illustrated comprises a mixing valve 1, to the housing of which are joined pipes 2 and 3 for the supply of hot and cold water respectively, and apipe 4 through-which the water flows to the bath or other appliance for which it is required. The pipes 2 and 3 are controlled by stop cocks 5 and 6 respectively, and are connected by branch pipes 7 and 8 respectively to a valve housing 11 containing a hot water valve 9 and ,a cold water valve 10. Twoway valves 19 and 20 in the pipes 2 and 3 allow of admitting the water alternatively to the valve 1 or to the pipes 7 and 8 respectively. The valves 9 and 10 are fixed to a valve plate 12, which has a depending stem 12 and is arranged above a thermo-' stat rod 13 of freely expanding material having at its upper'end a short boss 18 abutting against the stem 12*. A lead plate 31 rests on the valves ,9 and 10, and a coiled spring 32 is placed between this plate and the cover 33 of the valve housing. The plate 12 is arranged in a mixing chamber 16 having at the bottom an orifice, which opens into a conduit15 containing the thermostat 13, and is surrounded by a seat 14 for the plate 12. Permanent communication between the mixing chamber 16 and the conduit 15 is aflorded, by a duct 17. The valves 9 and 10 control the flow of hot and cold water from the pipes 7 and 8 respectively,

to the mixing chamber 16, and are designed so that the valve is closedby the .rising of the plate 12, and the valve 10 is closed by-the lowering of the said plate. 'The conduit 15 communicates at the bottom with the pipe 4, by, means of a union24.

The conduit 15 makes at the top a sliding joint with a union 21 screwed to the wall of the chamber 16, and is soldered or otherwise fixed at the bottom toa housing 22 inclosing the foot 27 of the thermostat 13.

-The, conduit 15 is surrounded by an outer tube or jacket 23, which is fixed to the union 21 and to the housing 22. By virtue of this arrangement the conduit 15 does not interfere with the action of the thermostat, and the expansion and contraction of the thermostat do not afllect the outer tube or jacket 23. The'latter is provided with holes 30. A, temperature indicator 25 with a dial 26 isv fitted to the housing22, to indicate the temperature of the water flowing from the conduit 15 to the pipe 1. The foot 27 of the thermostat13 is screwed into a seat in the The action of the apparatus is as follows:

The valves 19 and 20being turned to admit hot and cold water to the valve 1, the latter is opened, and a mixture of the hot and cold water flows through pipe 4 to the place where it'is reqpired, say a bath When a certain quantity of water'has been admitted to the bath the valve 1 is closed, and the valves 19 and 20 are turned to admit water to the pipes 7 and 8. This water is admitted by the valves 9,and 1 0 to the mixing cham-- ber 16 and flows thence through conduit-15 and pipe 4 to the bath. Acting under the influence of the temperature in the conduit 15 the thermostat adjusts the valves 9 and 10' so that exactly therequired mixture of hot and cold water is admitted. If the temperature from any cause exceeds the desired value, the thermostat rod expands and partly or wholly closes the valve 9, until the inflow of cold water has reduced the tem-- ter and reducing the admission of cold water, till the proper temperature is restored again.

What I claim as my invention anddesire to secure by Letters Patent of the United States is o v 1. In an apparatus for the purpose set forth, the combination of supply conduits conduit, valves severally controlling the flow of liquid from'said branch conduits to said second delivery conduit, and a thermostatic device influenced by the temperature in said second delivery conduit, arranged to actuate the last mentioned valves, whereby the opening of either of the last mentioned valves is accomplished by the closing of the other valve.

2. A device of the kind described comprising a main pipe and a thermostat supportlng pipe, a hot and cold water pipe supported on opposite sides of the thermostat supporting pipe, the hot and cold water pipes being in communication with the main pipe at the upper ends thereof, branch pipes for connecting the hot and cold water pipes with the thermostat supporting device at a point below the ends of the hot and cold water pipes, a valve casing connecting the thermostat supporting pipe and branch pipes, valves in the valve casing, said valves having openings adapte to aline with the interior of the branch pipes, a thermostat for supporting the valves, said thormostat being positioned in the thermostat support pipe,

whereby water flowing through the branch pipes and thermostat supporting pipe causes the openings of one valve to aline with its adjacent branch. pipe while the opposite valve prevents communication between the thermostat supporting pipe and the 'valve adjacent the second mentioned branch pipe.

In witnesswhereof I have signed this specification in the presence of two witnesses.

GUIDO STERN. Witnesses: I I

ALFONS VAN ROFSEN, CARL GRUND. 

